1551441 has 8 divisors (see below), whose sum is σ = 2074464. Its totient is φ = 1031360.

The previous prime is 1551383. The next prime is 1551449. The reversal of 1551441 is 1441551.

1551441 is a nontrivial binomial coefficient, being equal to C(1762, 2).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1551441 - 2¹⁷ = 1420369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1551449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1321 + ... + 2201.

It is an arithmetic number, because the mean of its divisors is an integer number (259308).

2^1551441 is an apocalyptic number.

1551441 is the 1761-st triangular number and also the 881-st hexagonal number.

It is an amenable number.

1551441 is a deficient number, since it is larger than the sum of its proper divisors (523023).

1551441 is an equidigital number, since it uses as much as digits as its factorization.

1551441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471.

The product of its digits is 400, while the sum is 21.

The square root of 1551441 is about 1245.5685448822. The cubic root of 1551441 is about 115.7653053045.

Adding to 1551441 its reverse (1441551), we get a palindrome (2992992).

It can be divided in two parts, 155 and 1441, that added together give a triangular number (1596 = T₅₆).

The spelling of 1551441 in words is "one million, five hundred fifty-one thousand, four hundred forty-one".